Relationships of Pinus koraiensis Cone Production with Stand and Climate Factors

Abstract

In order to analyze the relationship of Pinus koraiensis cone production with stand and climate factors,6 plots were set in a broad-leaved P. koraiensis forest at Liangshui nature reserve,Heilongjiang province in China. The cone production,diameter at breast height( DBH),and tree height( H) for each individual were investigated. The monthly climate factors( eg.,temperature,relative humidity and precipitation) were also measured. At a scale of individual,cones yield decreased with the DBH and H increasing. At a scale of stand,mean cone production per tree was not significantly related to forest age,and there was not significant difference between the stands at forest edge and the stands far away from forest edge. Between years,the cone production per tree significantly correlated with the mean air temperature in May and June,and precipitation in last June.